Re: 16" LX200R on an AP1200


Mar 30, 2007

 


----------------------------

#17644 Mar 30, 2007

Gavin,



There's a guy named Jeff Young that hangs out on the Astromart

Equipment forum that has exactly this setup. Not sure he's too happy

with the OTA but the mount seems to take the load just fine. You might

want to email him.



Eric

--- In ap-gto@yahoogroups.com, "Gav" gavbray@...> wrote:

>

> I'm considering mounting a 16" LX200R on my new AP1200. I believe the

> OTA weight is 110 lbs.

>

> By the time accessories etc are added this would be close to the

> advertised capacity limit of 140 lbs.

>

> This concerns me and I wonder if anyone can offer any advice as to

> whether this would be a suitable match or whether I'd be better with a

> 14" SCT (70 lbs). The scope would be used for visual work only and

> housed in an observatory.

>

> Is the extra 2" going to cause more problems than it's worth?

>

> Thanks

> Gavin

>



----------------------------

#17646 Mar 30, 2007

"jeybball" and Jeff Young are the same guy.



It's a long story, but I worked for a Unix company back before the whole

world had email, and so everyone used their initials for their email.

Mine are "jey". I first used Yahoo to manage a fantasy basketball with

a friend -- thus "jeybball". Later, it seemed like too much trouble to

create another account....



In any case, Gavin already found me on CloudyNights (where I go by the

somewhat simpler "Jeff Young").



But to answer the question directly, I'd be very much surprised if the

16" LX200R OTA were really 110 lbs. Meade quotes the GPS version at 120

lbs, but that includes the Dec axis trunions and drive system, which you

won't have. In any case, my 16" GPS OTA weighs on the order of 85 lbs

-- I'd expect the R version to be within 10% of that.



I'm using Parallax rings and the AP 15" ribbed plate, which likely add

another 15 lbs. The dovetail, rings and refractor on top are likely

good for another 20 lbs. Figure 120 lbs all told. I'm comfortable

enough with those weights on it that I'm considering going to a

considerably heavier OTA....



-- Jeff.











---------------



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On

Behalf Of Joseph Zeglinski

Sent: Friday, March 30, 2007 4:10 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] Re: 16" LX200R on an AP1200







Gavin,



Actually, there is a 16" LX200GPS/FC-100 on an AP1200 mount on a

permanent

pier, in the PHOTOS section of this group (see the LAST image in

the

Miscellaneous folder):



tech.ph.groups.yahoo.com/group/ap-gto/photos/view/ede6?b=18

tech.ph.groups.yahoo.com/group/ap-gto/photos/view/ede6?b=18>



You should contact the contributor "JEYBBALL" - I think it is

identical to

your system.



Joe

.----- Original Message -----

From: "ebuehrens" ebuehrens@...

mailto:ebuehrens%40rcn.com> >

To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com> >

Sent: Friday, March 30, 2007 7:34 AM

Subject: [ap-gto] Re: 16" LX200R on an AP1200



> Gavin,

>

> There's a guy named Jeff Young that hangs out on the Astromart

> Equipment forum that has exactly this setup. Not sure he's too

happy

> with the OTA but the mount seems to take the load just fine.

You might

> want to email him.

>

> Eric

>

> --- In ap-gto@yahoogroups.com

mailto:ap-gto%40yahoogroups.com> , "Gav" gavbray@...> wrote:

>>

>> I'm considering mounting a 16" LX200R on my new AP1200. I

believe the

>> OTA weight is 110 lbs.

>>

>> By the time accessories etc are added this would be close to

the

>> advertised capacity limit of 140 lbs.

>>

>> This concerns me and I wonder if anyone can offer any advice

as to

>> whether this would be a suitable match or whether I'd be

better with a

>> 14" SCT (70 lbs). The scope would be used for visual work

only and

>> housed in an observatory.

>>

>> Is the extra 2" going to cause more problems than it's worth?

>>

>> Thanks

>> Gavin

>>

>

>

>

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gto

groups.yahoo.com/group/ap-gto>

> Yahoo! Groups Links

>

>

>

>















[Non-text portions of this message have been removed]



----------------------------

#17649 Mar 30, 2007

Joe --



I certainly had too much flexure when I was using a Losmandy dovetail to

mount it. (The biggest problem was differential sag between the front

and rear which caused collimation changes.)



I've since switched to Parallax rings on the 15" ribbed plate -- a

combination which is much more rigid. There is still some flexure left,

but I like that: with a star diagonal rotated to different angles I

never can keep directions straight so I get my bearings by nudging the

OTA and seeing which way the view moves -- and I also sometimes jiggle

the OTA to bring out really low contrast objects or details. But all

the flexure is still in the plate/rings -- I have essentially zero

backlash on both axes and the axes themselves don't exhibit any

measurable flex.



-- Jeff.











---------------



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On

Behalf Of Joseph Zeglinski

Sent: Friday, March 30, 2007 10:14 PM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] Re: 16" LX200R on an AP1200







Glad you are in contact, Jeff.



Just a thought - have you tested shaft and dovetail flexure,

which might

increase if you go to an even larger OTA, even if the cradle

bolts don't shear

off, first?



I wonder if taking a circumpolar exposure, by rotating the mount

quickly,

might show elliptical paths, if there is any sign of flexure on

the OTA

attachment.

Perhaps, as a guess, reflecting a laser pointer off the counter

weight shaft,

onto the ceiling or dome, might show the beam angle deflected by

tiny bends of

the shaft.



Joe

.----- Original Message -----

From: "Jeff Young" jey@... mailto:jey%40adobe.com> >

To: ap-gto@yahoogroups.com mailto:ap-gto%40yahoogroups.com> >

Sent: Friday, March 30, 2007 4:48 PM

Subject: RE: [ap-gto] Re: 16" LX200R on an AP1200



[snip]

> I'm using Parallax rings and the AP 15" ribbed plate, which

likely add

> another 15 lbs. The dovetail, rings and refractor on top are

likely

> good for another 20 lbs. Figure 120 lbs all told. I'm

comfortable

> enough with those weights on it that I'm considering going to

a

> considerably heavier OTA....

>

> -- Jeff.

>

>

>

>















[Non-text portions of this message have been removed]







----------------------------

#17651 Mar 31, 2007

Gavin,

I have a LX200GPS OTA on an AP1200 with a Televue Pronto as a

guidescope permanently mounted in an observatory and it handles the

weight just fine. I am not sure of the wt. difference between the

LX200 and the LX200R but I would not rely on Meade for that info.

They

really could not give me an accurate wt. of the OTA only (I think

they

quoted 120 lbs.). They are use to the whole setup and usually will

quote you the OTA and fork arms wt. When I weighed my assembly I

think it was around 80 lbs. for the OTA only. Anyway, the mount has

no

trouble handling the weight. I have the scope mounted with a

Losmandy

dovetail.



Barbara

--- In ap-gto@yahoogroups.com, "Gav" gavbray@...> wrote:

>

> I'm considering mounting a 16" LX200R on my new AP1200. I believe

the

> OTA weight is 110 lbs.

>

> By the time accessories etc are added this would be close to the

> advertised capacity limit of 140 lbs.

>

> This concerns me and I wonder if anyone can offer any advice as to

> whether this would be a suitable match or whether I'd be better

with

a

> 14" SCT (70 lbs). The scope would be used for visual work only and

> housed in an observatory.

>

> Is the extra 2" going to cause more problems than it's worth?

>

> Thanks

> Gavin

>



----------------------------

#17652 Mar 31, 2007

Thanks Barbara for the reassurance. From what you and Jeff have said

I'm pretty sure I'm going to go with the 16". I just have to hope I

get a good one. :-)



Regards

Gavin



--- In ap-gto@yahoogroups.com, "Barbara Harris" barbharris1@...>

wrote: >

> Gavin,

> I have a LX200GPS OTA on an AP1200 with a Televue Pronto as a

> guidescope permanently mounted in an observatory and it handles

the > weight just fine. I am not sure of the wt. difference between the

> LX200 and the LX200R but I would not rely on Meade for that info.

> They

> really could not give me an accurate wt. of the OTA only (I think

> they

> quoted 120 lbs.). They are use to the whole setup and usually

will > quote you the OTA and fork arms wt. When I weighed my assembly I

> think it was around 80 lbs. for the OTA only. Anyway, the mount

has > no

> trouble handling the weight. I have the scope mounted with a

> Losmandy

> dovetail.

>

> Barbara

>

> --- In ap-gto@yahoogroups.com, "Gav" gavbray@> wrote:

> >

> > I'm considering mounting a 16" LX200R on my new AP1200. I

believe > the

> > OTA weight is 110 lbs.

> >

> > By the time accessories etc are added this would be close to the

> > advertised capacity limit of 140 lbs.

> >

> > This concerns me and I wonder if anyone can offer any advice as

to > > whether this would be a suitable match or whether I'd be better

> with

> a

> > 14" SCT (70 lbs). The scope would be used for visual work only

and > > housed in an observatory.

> >

> > Is the extra 2" going to cause more problems than it's worth?

> >

> > Thanks

> > Gavin

> >

>



----------------------------

#17653 Mar 31, 2007

I have the 16" LX200R mounted on my AP1200GTO, along with an Optec

filter wheel, an Optec focuser, a SBIG AO-L, and a SBIG ST-10XME. I

use a set of Parallax rings, on the top of which I have a Losmandy

dovetail holding a 90mm guidescope. I also use an 24" AstroPhysics

ribbed plate where I drilled a 2nd set of holes to mount one of the

Parallax rings. Because the 16" LX200R is so tail heavy the Parallax

rings are offset to one end of the ribbed plate, allowing me to

position the tail of the OTA closer to the Dec axis. I still need to

use some pancake weights towards the front of the OTA for proper Dec

balance.



I also found adding the 28" AstroPhysics counterweight shaft

necessary for the additional payload. But the system tracks

extremely well; I can't tell any degradation in performance from when

I had a C14 mounted on it. So, the AP1200 mount will easily carry

the 16" LX200R OTA and accessories.



--- In ap-gto@yahoogroups.com, "Gav" gavbray@...> wrote:

>

> I'm considering mounting a 16" LX200R on my new AP1200. I believe

the

> OTA weight is 110 lbs.

>

> By the time accessories etc are added this would be close to the

> advertised capacity limit of 140 lbs.

>

> This concerns me and I wonder if anyone can offer any advice as to

> whether this would be a suitable match or whether I'd be better

with

a

> 14" SCT (70 lbs). The scope would be used for visual work only and

> housed in an observatory.

>

> Is the extra 2" going to cause more problems than it's worth?

>

> Thanks

> Gavin

>



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